Fluid-pressure cut-off



(No Model.) 7 2 Sheets-Sheet; 1 P. B. GIESLER.

FLUID PRESSURE GUT-OFF. 'No. 596,433. Patented Dec. 28, 1897.

(No Model.) 2 Sheets-Sheet 2. P. B. GIESLER. FLUID PRESSURE GUT-OFF.

MDIHIH UNITED STATES PATENT OFFICE FRANKLIN B. GIESLER, OF MILWAUKEE, ISCONSIN.

FLUID-PRESSURE CUT-OFF.

SPECIFICATION forming part of Letters Patent No. 596,433, dated December 28, 897- Application filed January 28, 1897. Serial No. 621,039. (No model.)

To all whom it may concern.-

Be it known that I, FRANKLIN B. GIESLER, a citizen of the United States, and a resident of Milwaukee, in the county of Milwaukee and State of WVisconsin, have invented cer-. tain new and useful Improvements in Out- Offs; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention has for its main object to provide a simple economical means for automatically stopping the flow of a fluid under pressure to an apparatus or circulating system the instant a leak of any importance may occur, and it also contemplates a similar result incidental to manual operation of suitable mechanism, provision being made to prevent the ram that would otherwise take place incidental to sudden cessation of said flow. Hence said invention consists in certain peculiarities of construction and combination of parts hereinafter set forth with reference to the accompanying drawings and subsequently'claimed.

Figure l of the drawings represents a vertical transverse section of my device, the plane of the section being indicated by line 1 1 in Fig. 3; Fig. 2, an elevation, partly in section, on the irregular plane indicated by line 2 2 in the preceding figure; Figs.- 3 and 4, plan views, partly in horizontal section, these views being respectively indicated by lines 3 3 and 4t 4 in Fig. 1.

Referring by letter to the drawings, A represents a casing constituting a coupling for connecting a feeder of steam, ammonia, or other fluid under pressure with an apparatus or pipe system in which the fluid may be circulated. A horizontal partition I), provided with a valve-seat aperture 0, is arranged intermediate of the inlet-nozzle d and outletnozzle 6 of the casing. A hollow protuberance f of the casing below the inlet-nozzle d thereof contains a cylindrical plug B, provided with a passage 9, that is brought in and out of register with ports h '5, connecting the bore of said protuberance with said inletnozzle and the outlet-nozzle of said casing. The stem j ofthe plug turns in a stuffingbox gland 70, set in the protuberance of the casing, and a handle an is made fast to said stem.

From the foregoing it will be understood that provision is made for a by-pass at will between the inlet-nozzle and outlet-nozzle of the casing, the purpose of this by-pass being hereinafter set forth in connection with the term engineers valve, employed to comprehend the plug B and its handle.

A valve 0, corresponding to the seat portion of the aperture 0 in partition Z? of the casing A, has a plurality of depending arms it, connected to a preferably hollow cone D, and these arms are guided in said aperture. By having the cone hollow the same is lighter than it would be otherwise. The valve 0 has its play in the chamber portion of the casing A above partition Z), and the stem E of this valve has play in a stuffing-box gland 0, set in the detachable top F of said casing. The top is bolted to the body of the casing, and the joint between the two is sufficiently tight to prevent leak of the fluid under pressure' To increase the bearing for the valve-stem E, the casing-top is provided with an upwardly-extendin g boss 19, that is herein shown as being reduced for a portion of its length, the purpose of this reduction being hereinafter set forth.

Surrounding the boss 19 is a shell G, having a bottom flange held to the casing-top by means of screws, and the the valve-stem E, extending up through said boss, comes within the bore 0' of the shell, this bore being terminated a limited distance below the shell-top within an annular space 3, having communication with a port 15, leading up from the aforesaid chamber portion of the casing. A vent-port u leads from the shell-bore into a chambered fitting H, provided with vertically-disposed pop-valves o 10, both of which open in the same direction, and the top of the shell is provided with a seat-opening m, that is normally closed by a plunger I, having its upper end beveled to correspond with the seat portion of said opening in which it fits. The plunger is centered in the upper end of the shell-bore above the vent-port u, and seated on the top of the shell is a spiral spring J ,under compression against a plate K,loosely engaged by the stem L of said plunger, this plate being held in vertically-adjusted position by a nut y and a jam-nut 2', run on the screw-threaded upper end of the plungerstem.

The upper end of the valve-stem E is shown reduced to form a shoulder, on which a piston M is seated, and this piston is held to its seat by means of a clamp-nut N, run on a screwthread out upon the reduced end of said stem. The piston is shown as having a beveled upper edge, and a correspondingly beveled shoulder in the shell-bore constitutes a stop for limiting the upward stroke of said piston, the latter being shown as having a depending flange flared upon the interior thereof to thereby gradually decrease thickness ina downward direct-ion, and fluid under pressure within this flange tends to spread the same in an outward direction,whereby a sufliciently tight fit is maintained in said shell bore, clearance for said piston on its downstroke being had by reason of the reduced portion of boss 13 on casing-top F being proportioned to come within the piston-flange when said stroke occurs.

A passage 1), leading from the outlet-nozzle e of the casing up through the latter and its top, has communication with that portion of the shell-bore containing piston M in order that some of the fluid under pressure that has passed valve 0 may operate against said piston to support said valve away from its seat, and while any suitable means may be employed to establish this communication preference is given to a connection having a stop-cock, through which the said fluid may be cut off at will and that remainingin said shellbore readily exhausted. As herein shown, the connection above inferred may be athreeway stop-cock connected by nipples with the casing-top Fand shell G, the stem 0 of a hollow plug P, constituting part of the three-way cock, being rotative in a stuffing-box gland d and made fast to a long and short arm bellcrank.

The short arm Q of the bell-crank carries a weight R and is normally at rest against a stop 6, extending from the stuffing-box gland d, engaged by the stem 0 of hollow plug P, constituting part of the three-way stop-cock. The long arm S of the bell-crank is shown connected to a cable T, that may lead to any convenient point more or less distant from the stop-cock, this cable serving as a convenient means to actuate said bell-crank against resistance of said weight.

A port F of the hollow plug P is normally open to the passage b in the casing, and another port g of said plug is normally out of register with an exhaust-port h, pertaining to the chamber in which the aforesaid plug has its rotary movement. A pipe U, fitted in the latter port, may lead to any convenient point for exhaust of fluid under pressure from the bore of shell G above specified.

In practice all the working parts above specified are normally in position best shown in Fig. 1, and should an important leak occur in the apparatus or circulating system connected to the outlet'of casing A there will be a reduction of pressure ahead of the valve 0, as well as in the shell-bore under the piston M; Therefore said valve will instantly find its seat by gravity, aided by the velocity of the fluid under pressure exerted upon the aforesaid valve and the exterior of the cone in suspension therefrom. This instant automatic cut-off is of especial value in connection with the use of ammonia for the reduction of temperature, as thereby the diffusion of fumes dangerous to life is prevented. The same result may be obtained by cutting off the main volume of the fluid under pressure from the shell-bore and permitting the ready exhaust of so much of said fluid as may remain in said bore under the piston on the valvestem, this operation being effected in times of emergency or whenever it may be found desirable to test the working of the valve. By employing the cone D the surface area exposed to steam is increased, and thus operation of the valve is facilitated. The weightand-crank-controlled three way stop cock above specified constitutes a ready means for effecting the instant automatic seating of the cut-off valve at will, it being understood that the movement of the bell-crank to lift the weight will cause a partial rotation of hollow plug P to bring its port f away from the passage 1) in casing A and the other port g opposite the exhaust. On release of the bell-crank the hollow plug is automatically brought to normal position incidental to the limited descent of weight K, carried by the short arm of said crank.

On descent of the valve 0 the pop-valve w opens to prevent formation of a vacuum above piston M, and when said valve is lifted the pop-valve 12 opens to prevent an air-cushion against said piston.

hen the valt e O finds its seat, as above described, the back pressure operating upon the plunger I retracts the latter against the resistance of spring J away from the opening w in the top of shell G, to thereby prevent the ram that would otherwise occur, said plunger being thereafter automatically returned to normal position by expansion of said spring. It will also be understood that pop-valve U opens as the plunger descends, thus preventing an air resistance when this descent takes place. The valve 0 having been seated, it is necessary to open the engineers valve in order that the fluid under pressure may operate upon the former Valve, to thus open the partition-aperture intermediate of the casing inlet and outlet. At the same time some of the fluid under pressure will find its way into the shell-bore under piston M, to thereby support said valve away from its seat for an indefinite period, the engineers valve being closed when the automatic lifting of the cut-off valve 0 has been accomplished.

The proportions of the parts are such that seating of valve 0 does not have the effect of causing piston M to cut off shell-bore r from the hollow plug P, and the latter being normally positioned to have its port f register with passage b fluid under pressure ascend- IIO ing this passage readily finds its way intosaid shell-bore under said piston.

Having thus described my invention, what Iclaim as new, and desire to secure by Letters Patent, is

1. The combination of a casing having an inlet, an outlet and a partition intermediate of the inlet and outlet provided with an aperture; an engineers valve controlling a bypass between the inlet and outlet of the casing below the partition therein, a Valve for the partition-aperture, a cone suspended from the latter valve, a shell supported above the casing, a piston within the bore of the shell in stem connection with the cone-supporting valve, and suitable means for admitting to said shell, below the piston, some of the vol- 11 me of fluid under pressure that may pass either of the aforesaid valves.

2. The combination of a casing having an inlet, an outlet and a partition intermediate of the inlet and outlet provided with an aperture; an engineers valve controlling a bypass between the inlet and outlet of the casing below the partition therein, a valve for the partition-aperture, a cone suspended from the latter valve, a shell supported above the easin g, a piston within the bore of the shell in stem connection with the cone-supporting valve, suitable means for admitting to said shell, below the piston, some of a volume of fiuid under pressure that may pass either of the aforesaid valves, and a pair of pop-valves controlling a vent-port in the aforesaid shell above said piston.

3. The combination of a casing having an inlet, an outlet and a partition intermediate of the inlet and outlet provided with an aperture; an engineers valve controlling a bypass between the inlet and outlet of the casing below the partition therein, a valve for the partition-aperture, a cone suspended from the latter valve, a shell supported above the easing, a piston within the bore of the shell in stem connection with the cone-supporting valve, suitable means for admitting to the shell, below the piston, some of a volume of fluid under pressure that may pass either of the aforesaid valves, and a spring-controlled plunger constituting a valve for an opening in the shell-top, a portion of this plunger being exposed to the fluid under pressure that may find its way through a port leading from the aforesaid easing into a chamber of said shell.

4. The combination of a casing having an inlet, an outlet and a partition intermediate of the inlet and outlet provided with an aperture; an engineers valve controlling a bypass between the inlet and outlet of the easing below the partition therein, a valve for the partition-aperture, a cone suspended from the latter valve, a shell supported above the casing, a piston within the bore of the shell in stem connection with the cone-supporting valve, suitable means for admitting to said shell, below the piston, some of a volume of fluid under pressure that may pass either of the aforesaid valves, and a stop-cock arranged to permit of the pressure under said piston being let off at will.

5. The combination of a casing having an inlet, an outlet and a partition intermediate of the inlet and outlet provided with an aperture; an engineers valve controlling a bypass between the inlet and outlet of the casing below the partition therein, a valve for the partition-aperture, a cone suspended from the latter valve, a shell supported above the casing, a piston within the bore of the shell in stem connection with the cone-supporting valve, and a three-way stop-cock having its chamber portion in connection with a passage leading from the casing-outlet and that portion of said shell containing the piston.

6. The combination of a casing having an inlet, an outlet and a partition intermediate of theinlet and outlet provided with an aperture, an engineers valve controlling a bypass between the inlet and outlet of the casing below the partition therein, a valve for the partition-aperture, a cone suspended from the latter valve, a shell supported above the casing, a piston within the bore of the shell in stem connection with the cone-supporting valve, a three-way stop-cock having its chamber portion in connection with a passage leading from the casing-outletand that portion of the said shell containing the piston, a weight-controlled bell-crank fast to the plug 100 portion of the stop-cock, and a stop arranged to maintain the bell-crank in normal position.

7 The herein-described cut-oft comprising a casing having an inlet, an outlet and a partition intermediate of the inlet and outlet pro- 10 5 vided with an aperture, an engineers valve controlling a by-pass between the inlet and outlet of the casing below the partition therein, a valve for the partition-aperture, a cone suspended from the latter valve, a shell sup- 11o ported above the casing and having a top opening leading from a space in port connection with said casing, a piston in the shell having stem connection with the cone-supporting valve, a pair of pop-valves controlling I 15 a vent-port in the shell above the'piston, a stop-cock having the chamber portion thereof in connection with that portion of the shell containing the piston and a passage leading from the casing-outlet,and a spring-controlled r 20 plunger constituting a valve for the shell-top opening.

In testimony that I. claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Wiscousin, in the presence of two witnesses.

' F. B. GIESLER.

Titnesses:

N. E. OLIPHANT, H. G. UNDERwoon. 

